prj-state-hub-retirement/DECISIONS.md

# Decision Log

_Auto-generated by the Custodian State Hub._

## Restore the previously-live seven-action tenant-engine image rather than rebuild

**Date:** 2026-08-16  
**Decided by:** grok  

The four-action regression is a pin problem, not a policy-authoring problem. Image sha256:9320df39 was CI-built from e9911eb, previously live 2026-08-11, and confirmed by tenant-engine on 2026-08-13. The tenant-engine policy has not changed since that commit. A new image would re-bake unrelated later packages and would not be the artifact already verified. TEN-WP-0006 guardrail actions stay out of this restore.

---

## Use the guardrail read/write split now: flex-auth may read, may not set

**Date:** 2026-08-16  
**Decided by:** grok  

TEN-WP-0006 split the actions so a PDP can read ceilings without changing them, and their tests call the read as actor=flex-auth. Leaving both actions on the single tenant-engine subject would keep the seam unused and leave the intended reader failing unknown_subject. This is a real difference: flex-auth set is denied action_not_granted. An ops write subject is out of scope; writes stay on the existing tenant-engine identity.

---


## Generation 2 was retired correctly; the correction matters more than the finding

**2026-08-20.** `SHR-WP-0002`'s first draft asserted that `inter-hub` had
"retired itself by attrition", inferring it from three true observations: no
`~/inter-hub` repo, a dead CoulombCore endpoint, and a railiance01 Deployment
scaled `0/0`.

The inference was wrong. `core-hub/workplans/archived/260708-CORE-WP-0007-haskell-retirement.md`
records that `CORE-WP-0005` closed the production cutover gates on 2026-07-03 —
`hub.coulomb.social` serving Core Hub, Inter-Hub compatibility, staging import
and dual-run smokes all closed — and that Haskell/IHP retirement followed on
2026-07-08 after a stabilization window and explicit operator approval to retire
the Inter-Hub rollback deployment. The `0/0` Deployment **is** that rollback
standby, at its designed end state.

Recorded because the failure mode generalises: **live documents described a
retirement that had already happened, and the completed evidence was in an
archived workplan.** `core-hub/SCOPE.md` still lists cutover planning as in
scope. A reader checking current files would reach the wrong conclusion, as this
project did. Retirement evidence needs to be discoverable from the live record,
not only from the archive — a requirement that applies directly to the State Hub
retirement this project is planning.

The real finding survived the correction and sharpened: **the gen-3 runtime
serves from the host being decommissioned.**